Axial gap motor

Abstract

The present axial gap motor is provided with: a rotor that is rotatable around a rotation axis; and a pair of stators that are opposed to each other with the rotor interposed therebetween from both sides in a rotation axis direction which is parallel with the rotation axis of the rotor. The rotor includes: a plurality of main magnets arranged in a circumferential direction so that a flux direction is parallel with the rotation axis direction; a sub permanent magnet which is disposed in the vicinity of a circumferential end portion of the main magnet and is magnetized in a direction perpendicular to the rotation axis direction and a radial direction; and a magnetic member which is provided on a surface of at least one of the one side and the other side in the rotation axis direction of the main magnet. A length of the magnetic member in the rotation axis direction is larger than a length of the sub permanent magnet in the rotation axis direction.

1. An axial gap motor comprising:
 a rotor that is rotatable around a rotation axis; and 
 a pair of stators that are opposed to each other with the rotor interposed therebetween from both sides in a rotation axis direction which is parallel with the rotation axis of the rotor, each stator having a plurality of teeth extending toward the rotor, wherein each tooth extends in parallel with the rotation axis direction and has a circumferential width that changes to be reduced from an outside toward an inside in a radial direction, 
 wherein the rotor includes: 
 a plurality of main magnets arranged in a circumferential direction so that a flux direction is parallel with the rotation axis direction; 
 a sub permanent magnet which is disposed in the vicinity of a circumferential end portion of the main magnet and is magnetized in a direction perpendicular to the rotation axis direction and the radial direction; and 
 a magnetic member which is provided on a surface of at least one of the one side and the other side in the rotation axis direction of the main magnet, 
 wherein a length of the magnetic member in the rotation axis direction is larger than a length of the sub permanent magnet in the rotation axis direction, 
 wherein a circumferential end portion of the magnetic member changes to be reduced in size from the outside toward the inside in the radial direction to maintain a substantially uniform distance between a front end portion of each tooth and the circumferential end portion of the magnetic member; 
 wherein the circumferential end portion of the magnetic member is provided with a chamfered portion having a chamfered shape; and 
 wherein a first interval between the magnetic members is defined between inner ends of adjacent the chamfered portion portions in the circumferential direction and a second interval is defined between outer ends of adjacent chamfered portions in the circumferential direction, changes to be reduced in size from an outside toward an inside in the radial direction and wherein each tooth has an outer-peripheral circumferential width and an inner-peripheral circumferential width of a front end portion, the second interval being equal to or greater than the outer-peripheral circumferential width and the first interval being equal to or greater than the inner-peripheral circumferential width. 
 
     
     
       2. An axial gap motor comprising:
 a rotor that is rotatable around a rotation axis; and 
 a pair of stators that are opposed to each other with the rotor interposed therebetween from both sides in a rotation axis direction which is parallel with the rotation axis of the rotor, each stator haying a plurality of teeth extending toward the rotor, wherein each tooth extends in parallel with the rotation axis direction and has a circumferential width that changes to be reduced from an outside toward an inside in a radial direction, 
 wherein the rotor includes: 
 a plurality of main magnets arranged in a circumferential direction so that a flux direction is parallel with the rotation axis direction; 
 a sub permanent magnet which is disposed in the vicinity of a circumferential end portion of the main magnet and is magnetized in a direction perpendicular to the rotation axis direction and the radial direction; and 
 a magnetic member which is provided on a surface of at least one of the one side and the other side in the rotation axis direction of the main magnet, 
 wherein a length of the magnetic member in the rotation axis direction is larger than a length of the sub permanent magnet in the rotation axis direction, 
 wherein a circumferential end portion of the magnetic member changes to be reduced in size from the outside toward the inside in the radial direction to maintain a substantially uniform distance between a front end portion of each tooth and the circumferential end portion of the magnetic member; 
 wherein the circumferential end portion of the magnetic member is provided with a curved surface portion having a substantially arc shaped cross-section in the radial direction; and 
 wherein a first interval between the magnetic members is defined between inner ends of adjacent the curved surface portion portions in the circumferential direction and a second interval is defined between outer ends of adjacent chamfered portions in the circumferential direction, changes to be reduced in size from an outside toward an inside in the radial direction and wherein each tooth has an outer-peripheral circumferential width and an inner-peripheral circumferential width of a front end portion, the second interval being equal to or greater than the outer-peripheral circumferential width and the first interval being equal to or greater than the inner-peripheral circumferential width.